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EP-4736548-A1 - METHOD AND APPARATUS FOR SYNCHRONIZATION

EP4736548A1EP 4736548 A1EP4736548 A1EP 4736548A1EP-4736548-A1

Abstract

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE). The communication methods and base station and UE implementations proposed in this disclosure implement new methods of PSS generation, in which predetermined M-sequences defined by predetermined polynomials and shifts are used, and new methods of spacing SS/PBCH transmissions of different existing radio access technologies (RATs) simultaneously supported in a network in the frequency and/or time domain.

Inventors

  • VLADIMIROVICH, Davydov Alexei
  • VLADIMIROVICH, Morozov Gregory
  • SERGEYEVICH, Dikarev Dmitry
  • ALEKSANDROVICH, Ermolaev Gregory
  • VIKTOROVICH, Esiunin Denis
  • VIKTOROVICH, Esiunin Maksim
  • ALEXANDROVICH, Pestretsov Vladimir

Assignees

  • Samsung Electronics Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240805

Claims (15)

  1. A method performed by a base station, the method comprising: generating one or more synchronization signal (SS) / physical broadcast channel (PBCH) blocks, wherein M-sequence is used to modulate a primary synchronization signal (PSS) included in an SS of the SS/PBCH block; transmitting the one or more generated SS/PBCH blocks, wherein each of the one or more generated SS/PBCH blocks is transmitted on first resource different at least in part from second resource used by an other communication system; and receiving from the UE, based on detected one or more SS/PBCH blocks, an uplink transmission.
  2. The method of claim 1, wherein each of the one or more generated SS/PBCH blocks is transmitted on orthogonal frequency division multiplexing (OFDM) symbols not used by the other communication system.
  3. The method of claim 1, wherein a synchronization channel raster in which the one or more generated SS/PBCH blocks are transmitted is positioned with a synchronization channel frequency offset relative to a synchronization channel raster according to which one or more SS/PBCH blocks used in the other communication system are emitted, wherein the synchronization channel frequency offset is selected so as to provide partial overlap or complete absence of overlap in a frequency domain between each of the one or more generated SS/PBCH blocks and each of the one or more SS/PBCH blocks used by the other communication system.
  4. The method of claim 3, wherein the synchronization channel frequency offset is greater than or equal to a half of the synchronization channel raster according to which the one or more SS/PBCH blocks used by the other communication system are transmitted.
  5. The method of claim 3, wherein the synchronization channel frequency offset is specified by an integer number of frequency intervals between adjacent subcarriers of each of the one or more SS/PBCH blocks.
  6. The method of claim 1, wherein identifier is determined based on , wherein value is identified based on the PSS, and value is identified base on a secondary synchronization signal (SSS) included in the SS of the SS/PBCH block.
  7. The method of claim 6, wherein the PSS is generated by performing the following steps of: using a predetermined polynomial, generating the M-sequence; performing a cyclic shift of the generated M-sequence according to the value; performing binary phase-shift keying (BPSK) modulation on the cyclically shifted M-sequence; mapping the modulated M-sequence to subcarriers; and performing cyclic prefix OFDM (CP-OFDM) on a symbol sequence obtained by the mapping.
  8. The method of claim 6, wherein the PSS is generated by performing the following steps of: using a predetermined polynomial defined by the value , generating the M-sequence; performing cyclic extension of the generated M-sequence to a length equal to a power of 2; performing /2-BPSK-based modulation on the cyclically extended M-sequence; performing spectrum spreading of the modulated M-sequence by a discrete fourier transform (DFT); mapping the spectrum spreaded M-sequence onto subcarriers; and performing CP-OFDM on a symbol sequence obtained by the mapping.
  9. A method performed by a user equipment (UE), the method comprising: receiving, from a base station, one or more synchronization signal (SS)/ physical broadcast channel (PBCH) blocks, wherein M sequence is used to modulate a primary synchronization signal (PSS) included in an SS of the SS/PBCH block; performing a procedure for accessing the base station; and in response to completion of the procedure for accessing the base station, performing an uplink transmission to the base station, wherein each of the one or more SS/PBCH blocks is detected on first resource different at least in part from second resource used by an other communication system.
  10. The method of claim 9, wherein each of the one or more SS/PBCH blocks is detected on orthogonal frequency division multiplexing (OFDM) symbols not used by the other communication system.
  11. The method of claim 9, wherein a synchronization channel raster in which the one or more SS/PBCH blocks are detected is positioned with a synchronization channel frequency offset relative to a synchronization channel raster in which one or more SS/PBCH blocks used in the other communications are emitted, wherein the synchronization channel frequency offset is selected so as to provide partial overlap or complete absence of overlap in a frequency domain between each of the one or more detected SS/PBCH blocks and each of the one or more SS/PBCH blocks used by the other communication system.
  12. The method of claim 9, wherein the receiving of the one or more SS/PBCH blocks comprises the following steps of: performing rough time and frequency synchronization with a cell, detecting PSS signaling value, detecting SSS signaling value, performing, based on the detected SSS, fine time and frequency synchronization with the cell, determining identifier of the cell, and detecting and decoding, based at least in part on the determined cell identifier, physical broadcast channel (PBCH), wherein performing the procedure for accessing the base station comprises the step of: detecting and decoding SIB emitted by the base station.
  13. The method of claim 12, wherein the PSS detection is performed on a basis of PSS candidates by performing matched filtering with a search of a frequency offset and the value according to maximum likelihood criterion, wherein predetermined polynomials and predetermined shifts are used at the UE to generate the PSS candidates.
  14. A base station comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: generate one or more synchronization signal (SS) / physical broadcast channel (PBCH) blocks, wherein M-sequence is used to modulate a primary synchronization signal (PSS) included in an SS of the SS/PBCH block, transmit the one or more generated SS/PBCH blocks, wherein each of the one or more generated SS/PBCH blocks is transmitted on first resource different at least in part from second resource used by an other communication system, and receive from the UE, based on detected one or more SS/PBCH blocks, an uplink transmission.
  15. A user equipment (UE) comprising: a transceiver; and at least one processor coupled with the transceiver and configured to: receive, from a base station, one or more synchronization signal (SS)/ physical broadcast channel (PBCH) blocks, wherein M sequence is used to modulate a primary synchronization signal (PSS) included in an SS of the SS/PBCH block; perform a procedure for accessing the base station; and in response to completion of the procedure for accessing the base station, perform an uplink transmission to the base station, wherein each of the one or more SS/PBCH blocks is detected on first resource different at least in part from second resource used by an other communication system.

Description

METHOD AND APPARATUS FOR SYNCHRONIZATION The present disclosure relates to a method and an apparatus for synchronization in wireless communication system, and more particularly to a method and apparatus for transmitting or receiving a synchronization signal included in a synchronization signal (SS) / physical broadcast channel (PBCH) block. Considering the development of wireless communication from generation to generation, the technologies have been developed mainly for services targeting humans, such as voice calls, multimedia services, and data services. Following the commercialization of 5G (5th-generation) communication systems, it is expected that the number of connected devices will exponentially grow. Increasingly, these will be connected to communication networks. Examples of connected things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various form-factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6G (6th-generation) era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems. 6G communication systems, which are expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga)-level bps and a radio latency less than 100μsec, and thus will be 50 times as fast as 5G communication systems and have the 1/10 radio latency thereof. In order to accomplish such a high data rate and an ultra-low latency, it has been considered to implement 6G communication systems in a terahertz band (for example, 95GHz to 3THz bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in mmWave bands introduced in 5G, technologies capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, radio frequency (RF) elements, antennas, novel waveforms having a better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, and multiantenna transmission technologies such as large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS). Moreover, in order to improve the spectral efficiency and the overall network performances, the following technologies have been developed for 6G communication systems: a full-duplex technology for enabling an uplink transmission and a downlink transmission to simultaneously use the same frequency resource at the same time; a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner; an improved network structure for supporting mobile base stations and the like and enabling network operation optimization and automation and the like; a dynamic spectrum sharing technology via collision avoidance based on a prediction of spectrum usage; an use of artificial intelligence (AI) in wireless communication for improvement of overall network operation by utilizing AI from a designing phase for developing 6G and internalizing end-to-end AI support functions; and a next-generation distributed computing technology for overcoming the limit of UE computing ability through reachable super-high-performance communication and computing resources (such as mobile edge computing (MEC), clouds, and the like) over the network. In addition, through designing new protocols to be used in 6G communication systems, developing mechanisms for implementing a hardware-based security environment and safe use of data, and developing technologies for maintaining privacy, attempts to strengthen the connectivity between devices, optimize the network, promote softwarization of network entities, and increase the openness of wireless communications are continuing. It is expected that research and development of 6G communication systems in hyper-connectivity, including person to machine (P2M) as well as machine to machine (M2M), will allow the next hyper-connected experience. Particularly, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica could be provided through 6G communication systems. In addition, services such as remote surgery for security and reliability enhancement, industrial automation, and emergency response will be provided through the 6G communication system such that the